The AD7986 is an 18-bit, 2 MSPS successive approximation, analog-to-digital converter (ADC). It contains a low power, high speed, 18-bit sampling ADC, an internal conversion clock, an internal reference (and buffer), error correction circuits, and a versatile serial interface port. On rising edge of CNV, the AD7986 samples the voltage difference between the IN+ and IN- pins. The voltages on these pins usually swing in opposite
phases between 0 V and REF. It features a very high sampling rate turbo mode (TURBO=high) and a reduced power normal mode (TURBO=low) for low power applications where the power is scaled with the throughput.
In normal mode (TURBO=low), the SPI-compatible serial interface also features the ability, using the SDI input, to daisychain several ADCs on a single 3-wire bus and provide an optional busy indicator. It is compatible with 1.8 V, 2.5 V, and 3 V using the separate VIO supply.
The AD7986 is available in a 20-lead QFN (LFCSP) with operation specified from -40°C to +85°C.